Waterproof watch crown



19494 c. B. GREENBERG WATERPROOF WATCH CROWN Filed Aug. 17, 1944 WATCH CAJE v Chqvlm's B. Greznbzrq INVENTOR ATTORNEY Patented Aug. 16, 1949 UNITED :F'STATFES h. PATENT OFFICE "WATERPROOF WATCH CROWN Charles B.' Greenberg New YorlgN. Y. App ication August 17, 1944,8eria1 No. 549,813

(o1:-5s 90) I Claims.

My inventionrelateato waterproof crowns for watches and, in more detail,"to a simple resilient washer and flanged tube. holding means suitable for forming the closure element between the crown and thewatch tube. I

The present invention is animprovement on the invention described in myPatent No. 2,377,625, granted June 5, 1945.

An object of my invention is to simplify the structure and the method "of assemblage of the waterproof watch-crown byi decreasing the number of the elements used in providing the waterproof closure between the tube; of the watch and thecrown. A" second object is to provide two separate sealing contactsurfaces between the resilient washer and the tube. A third object is to provide a maximum area of sealing contact inside the crown frame and about the tube of the watch. A fourth object is to provide an enlarged waterproof seal about the watch tube without increasing the height of the crown, thus making possible the use of a thin crown yet providing an effective waterproof seal.

I accomplish these and other objects by inserting in a cup-shaped watch crown frame a resilient washer and holding or securing it therein by wedging or force fitting a tube formed with an inward extending flange at its outer end into the cup frame, the inward extending flange retaining the resilient washer in position inside the cup.

In the drawing Fig. 1 is a plan view looking into my cup-shaped waterproof crown, Fig. 2 is a vertical section through the center of the crown and Fig. 3 is a vertical section through a variation showing a different washer.

In the drawing and in the specification corresponding numerals indicate the same elements. Referring to the drawing, my cup-shaped crown frame I is formed provided with the circular side extending wall 2, base 3 and the internally threaded post or stem 4 positioned in the center of the base.

My resilient washer or tube 5 provided with an inward extending flange 6 is positioned inside the frame and resting on and against the base 2 and with the flange 6 fitting snugly about the post 4. The inside diameter of the washer is of the proper size to fit snugly about the tube (shown in dashed lines) of the watch with which the crown is used, and the flange 6 is of a suflicient thickness that it resiliently supports the tube of the watch and acts as an additional seal.

A retaining or locking element comprised of a tube 1 with an inward extending flange 8 at its outer end is secured in the crown frame opena double seal about the ing by wedging, force fitting or-other suitable means. The tube encases the sides of theresilientwasher while the fiange exerts a pressure against the part of the end of the resilient washer with which it is in contact. This pressure against the end of the washer is transmitted in all directions and slightly decreases its inner diameter, thus continuously forcing the resilient washer against the watch tube. This structure provides tube of the watch as the resilient washer fits closely against the sides of the watch tube and the resilient flange seals the end of the tube.

The crown is simply and quickly assembled by, l, inserting the-resilient washer into an inverted holding tube and then, 2, force fitting the holding tube into the crown frame opening.

In the variation shown in Fig. 3 the crown frame 1 I is provided with the resilient washer l2 which is formed with the inward and outward extending flanges i3 and l 4, respectively, and with the holding flanged tube [5 similar to the elements 1 and 8 shown in Fig. 2 and Fig. 3. The outward extending flange fits snugly against the crown frame and supports the end of the holding tube I5 and the inward extending flange rests against the post and supports the end of the watch tube. Thus, this structure in addition to providing a closure between the resilient washer and the sides of the watch tube provides a seal at the end of the watch tube and also at the end of the holding tube.

Although I have shown and described my waterproof crown in two of its better forms many variations are possible without departing from the spirit and scope of the ideas conveyed in the drawing and description, and so I desire to cover all modifications, forms and embodiments of my invention coming within the scope and language of any and all of the claims.

I claim:

1. In a waterproof crown for type watch case formed with a cup-shaped crown frame provided with a central winding post, a resilient flanged washer positioned inside the cup frame, the flange part fitting snugly against the winding post of the frame and the washer against the tube of the watch case and a flanged holding tube, the flange extending inwardly toward the winding post, and the tube secured against the cup frame about the resilient washer and partly covering its end and retaining it inside the cup.

2. In a waterproof watch crown for use with a watch case provided with a tube, the crown formed with a cup-shaped opening therein. a

use with a tube 3. In a waterproof watch crown for use with a watch case provided with a tube, the crown formed with a cup-shaped opening therein, a'

winding post extending in the opening; a resilient flanged washer positioned in the opening and extending flange,

inside the cup frame with the flange extending inwardly toward the winding post and holding and forcing the resilient washer against the cup frame and inwardly against the tube of the watch case to provide a tight closure thereagainst.

5. In a waterproof crown for use with a tube type watch case formed with a cup-shaped crown provided with a central winding post, a resilient washer formed with an inward and an outward the washer positioned inside the cup and about the winding post with the flanged sections resting against the cup frame at its sides and under portions and against the winding tube, and a holding tube formed with about the winding post, the washer having the proper inner diameter to provide a snug fit against the watch case tube and the flange of a proper diameter and thickness to provide a resilient seat for the end of the watch case tube, and a flanged holding tube, the flange extending inwardly'towardthe winding post, and the tube secured in the cupopening and retaining the resilient washer inside the cup, the sides of the tube wedged against the cup and the flange extending inward partially covering and holding the resilent washer. V

4. In a waterproof crown type watch case formed with a cup-shaped crown frame provided with a central winding post, a resilent flanged washer positioned inside and resting against the crown frame and the flange against the winding post, a flanged tube wedged for use with a tube v a flange extending inwardly toward the winding post, the tube wedged into the cup against its sides and the flange extending over, partially covering and holding the resilient washer in position inside the cup.

CHARLES B. GREENBERG; REFERENCES CITED The following references are of record in the file of this patent: V

UNITED STATES PATENT 209,993 switzerland n' nn Aug. 16, 1940 

